package com.fhs.common.utils;

import org.apache.commons.codec.binary.Base64;

import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

/**
 * AES加密解密工具类
 *
 * @author jackwong
 */
public class AESUtil {

    private  static Logger LOG = Logger.getLogger(AESUtil.class);

    /**
     * 加密
     *
     * @param content  需要加密的内容
     * @param password 加密密码
     * @return
     */
    public static String encrypt(String content, String password) {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
//kgen.init(128, new SecureRandom(password.getBytes()));//适用windows

//解决linux 系统下面出错问题
            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            random.setSeed(password.getBytes());
            kgen.init(128, random);

            SecretKey secretKey = kgen.generateKey();

            byte[] enCodeFormat = secretKey.getEncoded();

            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
            Cipher cipher = Cipher.getInstance("AES");// 创建密码器
            byte[] byteContent = content.getBytes("utf-8");
            cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
            byte[] result = cipher.doFinal(byteContent);
            return Base64.encodeBase64String(result);
        } catch (Exception e) {
            LOG.error("解密错误:"  + content + ",pass:" + password,e);
        }
        return null;
    }


    /**
     * 解密
     *
     * @param content  待解密内容
     * @param password 解密密钥
     * @return
     * @throws BadPaddingException 解析失败,秘钥和验证码不匹配
     */
    public static String decrypt(String content, String password)  {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            //解决linux 系统下面出错问题
            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            random.setSeed(password.getBytes());
            kgen.init(128, random);
            SecretKey secretKey = kgen.generateKey();
            byte[] enCodeFormat = secretKey.getEncoded();
            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
            Cipher cipher = Cipher.getInstance("AES");// 创建密码器
            cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
            byte[] result = cipher.doFinal(Base64.decodeBase64(content));
            return new String(result,"utf-8"); // 加密
        } catch (Exception e) {
            LOG.error("加密错误:"  + content + ",pass:" + password,e);
        }
        return null;
    }


    /**
     * 将二进制转换成16进制
     *
     * @param buf
     * @return
     */
    public static String parseByte2HexStr(byte buf[]) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < buf.length; i++) {
            String hex = Integer.toHexString(buf[i] & 0xFF);
            if (hex.length() == 1) {
                hex = '0' + hex;
            }
            sb.append(hex.toUpperCase());
        }
        return sb.toString();
    }


    /**
     * 将16进制转换为二进制
     *
     * @param hexStr
     * @return
     */
    public static byte[] parseHexStr2Byte(String hexStr) {
        if (hexStr.length() < 1)
            return null;
        byte[] result = new byte[hexStr.length() / 2];
        for (int i = 0; i < hexStr.length() / 2; i++) {
            int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
            int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
            result[i] = (byte) (high * 16 + low);
        }
        return result;
    }

}
